Unfortunately your bug report does not show any output from the installation of the shim-signed package. But I notice that the contents of your /boot/efi/efi/ubuntu directory are a bit unusual:
FSCK0000.000 fsck0000.001 FSCK0000.002 fsck0000.003 FSCK0000.004 FSCK0000.005 FSCK0000.006 FSCK0000.007 fsck0000.008 fw fwupx64.efi grub.cfg grubx64.efi MokManager.efi Perhaps the installation failed because of corruption on your EFI system partition? ** Changed in: shim-signed (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1652514 Title: package shim-signed 1.21.3+0.9+1465500757.14a5905.is.0.8-0ubuntu3 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/shim-signed/+bug/1652514/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs